'as far as I know' inside the box you'll get..
Motorcycle mount with mounting hardware*
Motorcycle power cable
* read as a RAM-B-309-x which comes with 60mm screws for PAN STxxxx or Goldwing GL and U-bolt for 25mm 1" handlebar plus a RAM-B-201-A and RAM-B-202 which attches onto the Garmin cradle.
Onto an oval rail on a 12GS, I say adapt slightly and use a RAM-B-231Z with RAP-319 and build from the arm upwards.
Sports bike riders can soon get a 'new' RAM yoke stem ball mount RAM-B-342 (see below) which may be not interest too many here.